(as) obstinate as a mule

(as) obstinate as a mule

Extremely reluctant or unwilling to change a particular opinion, behavior, or course of action, especially when faced with opposition. My toddler is as obstinate as a mule, and he'll throw a tantrum any time he doesn't get what he wants. You'll never get Rich to change his opinion—he's obstinate as a mule.

See also: mule, obstinate